We create the forward zone example.com by selecting Create master zone
and in the Create new zone dialog set the Zone type to Forward,
the Domain Name to example.com, the Master server to ns.example.com
and set Email address to the domain administrator’s email address and select Create.
Next, create the DNS entry for ns.example.com pointing to 172.17.42.1 and apply the configuration

To complete this tutorial we will create a address (A) entry for webserver.example.com
and then add a domain name alias (CNAME) entry www.example.com which will point to webserver.example.com.

To create the A entry, select the zone example.com and then select the Address option.
Set the Name to webserver and the Address to 192.168.1.1. To create the CNAME entry,
select the zone example.com and then select the Name Alias option.
Set the Name to www and the Real Name to webserver and apply the configuration.